Method used for producing sulfur-based urea compound fertilizer from ammonia desulphurization by-products

A technology of ammonia desulfurization and compound fertilizer, which is applied in the field of producing sulfur-based urea compound fertilizer, can solve the problems of poor product quality, high energy consumption, and large steam consumption, and achieve the effects of low cost, low energy consumption, and low desulfurization cost

Active Publication Date: 2015-12-02
JIANGSU NEW CENTURY JIANGNAN ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] The purpose of the present invention is to solve the shortcomings or deficiencies of the traditional sulfur-based urea com...

Method used

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  • Method used for producing sulfur-based urea compound fertilizer from ammonia desulphurization by-products

Examples

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Embodiment 1

[0033] 20000Nm 3 / h150℃, 5kPa, sulfur dioxide concentration 1000mg / Nm 3 of sulfur dioxide-containing tail gas, of which 19000Nm 3 / h directly enters the DN2400*35000 desulfurization tower, uses 15% ammonia water as the desulfurizer, and the concentration of sulfur dioxide in the clean gas after desulfurization is 20mg / Nm 3, after absorption, oxidation, concentration, solid-liquid separation (using centrifuge), 21kg / h wet material ammonium sulfate (water content 5%) is obtained and added to the molten urea tank, and raw material urea (nitrogen content 46.4%) is fed at a speed of 22kg / h Add the molten urea tank, the molten urea tank is equipped with a jacket, heated with 0.4MPa steam, and the temperature of the solution is controlled at 115-118°C. The molten urea tank is equipped with a stirrer. After fully mixed, pump into the fluidized bed, another 1000Nm 3 / h The tail gas containing sulfur dioxide is also passed into the fluidized bed, and the mixed solution is fluidized,...

Embodiment 2

[0035] 30000Nm 3 / h151℃, 6.6kPa, sulfur dioxide concentration 2000mg / Nm 3 of sulfur dioxide-containing tail gas, of which 26000Nm 3 / h directly enters the DN3000*36000 desulfurization tower, uses 25% ammonia water as the desulfurizer, and the concentration of sulfur dioxide in the clean gas after desulfurization is 23mg / Nm 3 After absorption, oxidation, concentration, and solid-liquid separation (using a plate and frame filter), 63kg / h of wet material ammonium sulfate (water content 5%) is obtained and added to the molten urea tank. The molten urea tank is equipped with a jacket and heated with 0.3MPa steam. Control the solution temperature to 112-115°C. The molten urea tank is equipped with a stirrer. At the same time, the raw material urea (46.4% nitrogen content) is added to the molten urea tank at a rate of 200kg / h, and after being fully mixed, it is pumped into the fluidized bed, and another 4000Nm 3 / h The tail gas containing sulfur dioxide is also passed into the fl...

Embodiment 3

[0037] 30000Nm 3 / h145℃, 2.6kPa, sulfur dioxide concentration 3000mg / Nm 3 The sulfur dioxide-containing tail gas directly enters the DN3200*36000 desulfurization tower, using liquid ammonia as the desulfurizer, and the concentration of sulfur dioxide in the clean gas after desulfurization is 29.8mg / Nm 3 , absorb, oxidize, concentrate, solid-liquid separation (drum filtration) to obtain 94kg / h wet material ammonium sulfate (water content 4.75%) into the molten urea tank, while the raw material urea (nitrogen content 46.4%) at a speed of 180kg / h Add molten urea to the tank, set a jacket on the molten urea tank, heat with 0.3MPa steam, and control the solution temperature to 111-114°C. The molten urea tank is equipped with a stirrer. After fully mixed, pump into the fluidized bed, another 2000Nm 3 / h, 152°C air is also passed into the fluidized bed, and the mixed solution is fluidized, dried and granulated. Gradually increase from import to export. The gas discharged from t...

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Abstract

The invention discloses a method used for producing sulfur-based urea compound fertilizer from ammonia desulphurization by-products. The method comprises following steps: sulfur dioxide-containing tail gas is delivered into a desulfurizing tower; ammonium hydroxide or liquid ammonia is sprayed so as to absorb sulfur dioxide, ammonium sulfite is oxidized with air, and an obtained product is subjected to concentration so as to obtain an ammonium sulfate slurry, and the ammonium sulfate slurry is subjected to solid-liquid separation so as to obtain an ammonium sulfate wet material; the ammonium sulfate wet material is delivered into a molten urea groove via a conveyor, solid urea is delivered into the molten urea groove via another hopper, and an obtained mixture is subjected to heating melting, or liquid urea is added directly; fluidization granulation is carried out, wherein dried seed crystal is delivered into a fluidized bed through one end, and is driven to flow to the other end of the fluidized bed in the fluidized bed; a mixed ammonium sulfate-urea composite solution is pumped into the fluidized bed, and multistage spraying is carried out; the sulfur dioxide-containing tail gas is delivered into the fluidized bed or/and fluidized drying with hot air is carried out, and semi-finished product sulfur-based urea compound fertilizer is obtained via seed crystal growth; and a obtained fluidization tail gas is subjected to dust separation, and is delivered into an ammonia desulphurization tower. According to the method, ammonium sulfate low in additional value is changed into sulfur-based urea high in additional value at low investment and operation cost.

Description

1. Technical field [0001] The invention relates to a process for producing sulfur-based urea compound fertilizer by utilizing the by-product of ammonia desulfurization. 2. Background technology [0002] The current ammonia-based flue gas desulfurization technology mainly subcontracts the by-products generated by desulfurization directly into ammonium sulfate fertilizer, and the urea produced by chemical fertilizer enterprises is also a separate product. [0003] Ammonia desulfurization technology uses liquid ammonia / ammonia water as a desulfurizing agent, and the by-product is ammonium sulfate. After the ammonium sulfate solution is discharged from the desulfurization tower, the ammonium sulfate crystals are produced after being swirled, centrifuged, and dried. Product recycling process. [0004] Ammonium sulfate is a low-concentration nitrogen fertilizer due to its low nitrogen content, which limits some application fields of ammonium sulfate. [0005] Urea is a high-nitr...

Claims

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Application Information

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IPC IPC(8): C05C13/00
Inventor 祁丽昉方翔张军罗勇迎徐建东
Owner JIANGSU NEW CENTURY JIANGNAN ENVIRONMENTAL PROTECTION
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